Question: Carol and Karl both solve difficult computer problems that come to the student desk. Carol makes 60% of the repairs and Karl 40%. However, Carol's

Carol and Karl both solve difficult computer problems that come to the student desk. Carol makes 60% of the repairs and Karl 40%. However, Carol's repairs are incomplete 4% of the time and Karl's are incomplete 6% of the time.
(a) Determine the probability that a repair is incomplete.
(b) If a repair is found to be incomplete, what is the probability that the repair was made by Karl?

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